Q .     If `f:R->R` is defined by

`f(x)={((cos3x-cosx)/x^2`,for `x!=0),(lambda,for x=0):}`
and if `f` is continuous at `x=0`,then `lambda` is equal to

EAMCET 2008
A

`-2`

B

`-4`

C

`-6`

D

`-8`

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